NameError in SearchBuilderBehavior when a facet has json: true

[sandbergja]

Steps to recreate

1. Follow these steps to get a local Blacklight
2. Go to http://localhost:3000/catalog/facet/language_ssim
3. Note that you get the language facet values as expected
4. In .internal_test_app/app/controllers/catalog_controller.rb, change:

   config.add_facet_field 'language_ssim', label: 'Language', limit: true
   

   to

   config.add_facet_field 'language_ssim', label: 'Language', limit: true, json: true
   

5. Go back to http://localhost:3000/catalog/facet/language_ssim
6. Note that you get an internal server error!

Error message

NameError (undefined local variable or method `solr_parameters' for #<SearchBuilder:[...]

        add_solr_facet_json_params(solr_parameters, facet, facet_config, limit: limit + 1, offset: offset, sort: sort, prefix: prefix)
                                   ^^^^^^^^^^^^^^^
Did you mean?  solr_params):

/Users/sandbergj/repos/blacklight/lib/blacklight/solr/search_builder_behavior.rb:264:in `add_facet_paging_to_solr'
[...]

I suspect that the "Did you mean" is correct, solr_parameters should be solr_params, although just making that change does not actually cause the facet values to show up for me.